The members-only mobile app from Blue Collar Lists is designed for contractors to rate customers in a unique forum. It helps contractors discover and control hidden costs associated with doing their job while providing a place to value good clients. Contractors can search by property address to see reviews written by other contractors to help when bidding the next job. They can also see bid activity anonymously sorted by trade to see how many are bidding the job and write reviews based on past or recently completed jobs. 781-591-4422; www.bluecollarlists.com.